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That's right, the pressure leaving the 825Y is fine. Seems there's something below ground preventing the full pressure from getting to the heads. In general, is it a good idea to insulate the 825Y or plumb it so it can be removed in the winter and re-attached in the spring?

reduced output from heads

Actually, the pressure from the 825Y is fine. I neglected to mention my neighbor helped me put a boiler shut off (spigot) in the copper pipe leaving the 825Y before going underground to the irrigation system and the pressure is good. The low pressure I'm assuming is due to a kinked line or a blockage somewhere.

reduced output from heads

My 10 year old irrigation system has lower pressure coming from the heads than is coming into the backflow (Febco 825Y) from the main water line. Are there adjustments that can be made to the 825Y to increase the pressure coming out of the heads?